JPH1158361A - Apparatus for manufacture of ready-mixed concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing ready-mixed concrete for advantageously executing temperature control of water to generate the concrete though quality of the concrete is lowered due to easy crack after placing the concrete caused by heat of the concrete by hydration or excessive drop of water temperature in winter. SOLUTION: A water supply facility 21 for supplying water is provided in a batcher plant 1. The facility 21 has a water tank 22, refrigerator 25 for cooling water in the tank 22, refrigerant tube 27, and a boiler 26 for feeding high temperature steam to the tank 22. In summer, the refrigerator 25 is driven to cool the water in the tank 22, and to send it to the plant 1. In winter, the water in the tank 22 is heated by the boiler 26, and fed to the plant 1. The water temperature is optimally managed through four seasons to manufacture ready mixed concrete of high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ready-mixed concrete manufacturing apparatus for supplying ready-mixed concrete to an agitator truck or the like.

[0002]

2. Description of the Related Art In a batcher plant, cement, aggregate, and water are automatically kneaded at a predetermined mixing ratio and supplied to an agitator truck or the like. The ready-mixed concrete produced in the batcher plant generates heat by a hydration reaction. If the calorific value is large, problems such as cracks occurring after concrete casting are caused. Therefore, it is desirable to cool the ready-mixed concrete.

Conventionally, the method of cooling ready-mixed concrete includes a method of cooling the whole batcher plant by air, a method of cooling coarse aggregate with cold air or cold water, a method of cooling fine aggregate or cement with cold air, and adding ice to mixed water. For example, a method of cooling the mixed water by performing the method has been performed.

[0004]

However, in all of the conventional methods, it is difficult to obtain a sufficient cooling effect of the ready-mixed concrete. In particular, when the temperature in summer is high, the solidification progresses between the transportation by the agitator truck and the casting, so that the fluidity is reduced. It was easy to cause a decrease. In the winter season, the temperature of the mixed water was too low, and in the worst case, the mixed water was frozen and easily hindered the production of ready-mixed concrete.

Accordingly, an object of the present invention is to provide an apparatus for producing ready-mixed concrete which can advantageously control the temperature of water for producing ready-mixed concrete.

[0006]

The apparatus for producing ready-mixed concrete according to the present invention comprises a batcher plant for producing ready-mixed concrete by mixing cement, aggregate and water, and a water supply facility for supplying water to the batcher plant. The water supply equipment is a water tank, a refrigerant pipe disposed in the water tank and a refrigerator for sending a refrigerant to the refrigerant pipe, a boiler for sending steam into the water tank, and water having a predetermined temperature in the water tank. And a pump for feeding the batcher plant.

[0007]

According to the present invention having the above-mentioned structure, in a relatively high temperature season other than the winter season, the water in the water tank is cooled by the refrigerator and supplied to the batcher plant as mixed water.

In winter when the water temperature is low, high-temperature steam generated by the boiler is sent into a water tank to raise the water temperature to a desired temperature and to supply the water to a batcher plant. Therefore, water at a desired temperature can be supplied to the batcher plant throughout the year to produce high-quality ready-mixed concrete.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an apparatus for producing ready-mixed concrete.

In FIG. 1, the ready-mixed concrete production apparatus comprises a batcher plant 1 and a water supply facility 21. First, the structure of the batcher plant 1 will be described. Reference numeral 2 denotes a tower, on which a fine aggregate tank 3, a cement tank 4, and a coarse aggregate tank 5 are provided. Fine aggregate (sand) is charged into the fine aggregate tank 3 by the conveyor 8, and the conveyor 7 is charged into the cement tank 4.
, Cement is charged, and coarse aggregate (gravel) is charged into the coarse aggregate tank 5 by the belt conveyor 8. The fine aggregate and coarse aggregate conveyed by the conveyor 8 are selectively fed into the fine aggregate tank 3 and the coarse aggregate tank 5 by the sorting means.

Measuring tanks 11, 12, and 13 are provided below the fine aggregate tank 3, the cement tank 4, and the coarse aggregate tank 5, respectively, and the fine aggregate, cement, and coarse bone are measured in predetermined amounts. The material is put into the collecting hopper 14 below. Mixers 15 and 16 are connected to a lower portion of the collecting hopper 14. The ready-mixed concrete produced by the mixers 15 and 16 is sent to a hopper 17 below the mixer, and is supplied from the hopper 17 to a drum 19 of an agitator truck 18.

Reference numeral 20 denotes a water measuring tank, which is a water supply facility 21.
Is supplied with water. This water is sent to the collecting hopper 14, where it is mixed with cement, fine aggregate and coarse aggregate. Although not shown, the tower 2 is also provided with an admixture supply facility, and supplies a predetermined amount of the admixture to the collecting hopper 14. 10 is a non-contact type temperature measuring device such as a radiation thermometer,
The temperature of the ready-mixed concrete discharged from the hopper 17 is measured.

Next, the water supply facility 21 will be described. 22
Denotes a water tank, which has a heat- and water-proof structure. Aquarium 22
Water is sent into the inside by the water supply system 23. On the top plate 24 of the water tank 22, a refrigerator 25 and a boiler 26 are installed. A refrigerant pipe 27 is arranged in a coil shape inside the water tank 22, and the refrigerant is sent from the refrigerator 25. The boiler 28 also supplies high-temperature steam through the pipe 28 to the water tank 22.
Send in. Water in the water tank 22 is sucked up by the pump 29 and sent to the measuring tank 20 through the pipe 30.

This apparatus for producing ready-mixed concrete has the above-described configuration. Next, a method for producing ready-mixed concrete will be described. The fine aggregate, cement, and coarse aggregate are sent to the fine aggregate tank 3, the cement tank 4, and the coarse aggregate tank 5, respectively, weighed, and collected by the collecting hopper 14.
It is thrown into. Further, the water in the water tank 22 is sucked up by the pump 29 and sent to the measuring tank 20, and a predetermined amount of water is put into the collecting hopper 14.

The ready-mixed raw material fed into the collecting hopper 14 at a predetermined mixing ratio is sent to mixers 15 and 16 to be stirred and mixed, and sent to the hopper 17. The ready-mixed concrete in the hopper 17 is discharged to the drum 19 of the agitator truck 18 and transported to the construction site by the agitator truck 18.

By the way, ready-mixed concrete generates heat due to the hydration reaction of cement, and cracks are likely to occur after casting concrete. Therefore, it is desirable to cool the ready-mixed concrete as much as possible except in winter, especially in summer. Then, the refrigerator 25 is driven to cool the water in the water tank 22, and the cooled water is sucked up by the pump 29 and sent to the measuring tank 20, whereby a low-temperature raw concrete can be generated. Hydrated concrete sufficiently cooled in this way sufficiently undergoes a hydration reaction, and high strength is obtained. It is generally considered that the temperature immediately after the production of ready-mixed concrete in summer is preferably 25 ° C. or less.

In winter, the water temperature is too low, and in the worst case, the water in the water tank 22 freezes. Then, the boiler 26 is driven to send high-temperature steam into the water tank 22 to warm the water.
The temperature immediately after the production of ready-mixed concrete in winter is generally 10 ° C.
-20 ° C is considered desirable.

In order to sufficiently control the temperature, the temperature of the ready-mixed concrete discharged from the hopper 17 to the drum 19 is measured by the temperature measuring device 10, and the refrigerator 25 and the boiler 26 are driven based on the measured result. It is desirable to control.
Further, it is desirable that the drum 19 of the agitator truck 18 has a heat insulating structure so that the temperature of the ready-mixed concrete does not change as much as possible during transportation of the ready-mixed concrete to the construction site.

[0019]

According to the present invention, it is possible to optimally control the water temperature throughout the four seasons, and to produce high-quality ready-mixed concrete.

[Brief description of the drawings]

FIG. 1 is a block diagram of a ready-mixed concrete manufacturing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Batcher plant 3 Fine aggregate tank 4 Cement tank 5 Coarse aggregate tank 14 Collecting hopper 17 Hopper 18 Agitator truck 19 Drum 20 Measuring tank 21 Water supply equipment 22 Water tank 25 Refrigerator 26 Boiler 27 Refrigerant pipe 29 Pump

Claims (1)

[Claims] 1. A batcher plant that mixes cement, aggregate, and water to produce ready-mixed concrete, and a water supply facility that supplies water to the batcher plant, wherein the water supply facility is provided with a water tank and a water tank. A refrigerant pipe provided and a refrigerator for sending refrigerant to the refrigerant pipe, a boiler for sending steam to the water tank, and a pump for feeding water having a predetermined temperature in the water tank to the batcher plant. Characteristic ready-mixed concrete manufacturing equipment.